<%@ Page Language="C#" debug="true"%>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>

<script language="C#" runat="server">

void Page_Load(Object sender, EventArgs e)
{
	Bitmap objBitmap = new Bitmap(200,200);

	Graphics objGraphic = Graphics.FromImage(objBitmap);

	SolidBrush redBrush   = new SolidBrush(Color.Red);
	SolidBrush blueBrush  = new SolidBrush(Color.Blue);
	SolidBrush greenBrush = new SolidBrush(Color.Green);
	SolidBrush whiteBrush = new SolidBrush(Color.White);
	Pen blackPen = new Pen(Color.Black, 2);

	objGraphic.FillRectangle(whiteBrush, 0, 0, 200, 200);

	objGraphic.DrawLine(blackPen, new Point(0,195), new Point(195,195));
	objGraphic.DrawLine(blackPen, new Point(5,5),   new Point(5,200));

	Single sngHighestValue, sngHeight1, sngHeight2, sngHeight3;
	Single sngValue1, sngValue2, sngValue3;

	sngValue1 = Convert.ToSingle(Request["v1"]);
	sngValue2 = Convert.ToSingle(Request["v2"]);
	sngValue3 = Convert.ToSingle(Request["v3"]);

	if (sngValue1 > sngValue2)
		sngHighestValue = sngValue1;
	else
		sngHighestValue = sngValue2;
		
	if (sngValue3 > sngHighestValue)
		sngHighestValue = sngValue3;

	if (sngHighestValue == 0)
		sngHighestValue = 1;

	sngHeight1 = (sngValue1 / sngHighestValue) * 190;
	sngHeight2 = (sngValue2 / sngHighestValue) * 190;
	sngHeight3 = (sngValue3 / sngHighestValue) * 190;

	objGraphic.FillRectangle(redBrush,    10,  194-sngHeight1, 50, sngHeight1);
	objGraphic.FillRectangle(blueBrush,   70,  194-sngHeight2, 50, sngHeight2);
	objGraphic.FillRectangle(greenBrush,  130, 194-sngHeight3, 50, sngHeight3);

        Response.ContentType = "image/gif";
 
        objBitmap.Save (Response.OutputStream, ImageFormat.Gif);

}

</script>
